JPS6333564Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to the seat of a vehicle such as an automobile, and the seat back, which is the backrest part, is divided into two parts, upper and lower, and at least the upper half of the seat back is rotatable back and forth. To provide a comfortable seat capable of arbitrarily adjusting the inclination angle of the upper half of the seat back according to the inclination angle of the backrest.

In the reclining seats used in current automobiles and other vehicles, the base end of the seat back frame is rotatably connected to the seat cushion frame, and the entire seat back can be tilted to any position according to the seat occupant's request. , to obtain the desired sitting posture. By the way, in such conventional reclining seats, although the inclination angle of the entire seat back can be adjusted arbitrarily, it is impossible to change the shape of the backrest surface of the seat back depending on the physique of the seated person and the difference in the overall backrest inclination angle. However, in order to obtain the best sitting posture, it is not only necessary to simply change the inclination angle of the entire seat back as in the past, but also to adjust the backrest of the seat back according to the physique of the occupant and the difference in the overall backrest inclination angle. It is also necessary to change the shape of the surface, and conventional reclining seats do not take any measures in this regard. In addition, not only reclining seats, but also other seats, such as fixed seatback seats in which the seatback is fixed so that it cannot rotate, have the same problems as mentioned above, and it is important to consider your physique and overall posture to obtain the best comfortable posture. It is desirable that the shape of the backrest surface of the seat back can be changed depending on the difference in the inclination angle of the backrest.

Further, the reclining seat requires a locking device for fixing and supporting the seatback at a predetermined tilted position, and heretofore, this locking device has generally been installed on both left and right sides or one side of the seatback frame. For this reason, the weight of the seated occupant, impact, and other loads act as a large torsional moment on the seatback frame and locking device, and it is necessary to counter this by making the frame double-piped or adding reinforcing members. Reinforcement measures had to be taken to increase rigidity, which resulted in increased weight and cost. In addition, due to its volume, the locking device protrudes to some extent toward the rear of the seatback, but if the locking device is attached to the side of the seatback frame like in a conventional seat, it will cause the locking device to protrude to the rear of the seatback. There is also the problem that this protrudes into the vicinity, resulting in a lack of space and impairing the seating comfort of rear seat passengers.

The present invention was made in order to solve the above-mentioned problem, and by adopting the structure described in the claims for utility model registration, the backrest surface of the seat back can be adjusted according to the physique of the seated person and the difference in the overall backrest inclination angle. To provide a seat in which the inclination angle of the upper half can be freely changed to ensure the best sitting posture, as well as weight reduction and effective use of space.

The present invention will be explained below with reference to the drawings.

Figure 1 shows the first embodiment of the seat according to the present invention, and shows only the seat back part, which is the main part of the seat according to the present invention, and the seat back frame is divided into two parts: a lower frame 1 and an upper frame 2. Both lower ends 3, 3 of this upper frame 2 are rotatably hinged to hinge brackets 4, 4 fixed to both ends of the upper surface of the lower frame 1 by means of pins 5, 5. 2 is configured to be able to freely rotate in the longitudinal direction of the seat with pins 5, 5 as rotation centers. Brackets 6, 6 are fixed to both sides of the lower end of the lower frame 1, and the lower frame 1 is connected to a seat cushion frame (not shown) in a reclining or fixed manner using the brackets 6, 6. .

Between the lower frame 1 and the upper frame 2, there is an extendable locking device 7 located at the center of the seat back for fixing the rotation of the upper frame 2, which is rotatable through a hinge connection, at an arbitrary position. Interventions have been made. The lock device 7 has a structure shown in FIG. 2, and includes an outer cylinder 8 and a rod 10 slidably inserted into the outer cylinder 8 via bearing members 9, 9 fixed to the outer cylinder 8. , the proximal end is the window 11 of the outer tube 8
The rod 10 is provided with an operating lever 12 extending freely through the rod 10 and extending outward, and a pair of coil springs 13 and 14 located inside the outer cylinder 8 and wound around the outer circumference of the rod 10. These coil springs 13 and 14 are wound in opposite directions and have an inner diameter smaller than the outer diameter of the rod 10 in a free state, and each inner end is latched to the stepped portions 15 and 16 of the operating lever 12. At the same time, each outer end is fixed to the outer cylinder 8.
7 and 17, respectively. Recesses 18, 18 are formed in the inner ends of the bearing members 9, 9, in which the outer ends of the coil springs 13, 14 are accommodated, and bottom surfaces 19, 19 of the recesses 18, 18 are formed.
is inclined with respect to the axis at an angle greater than the natural helical angle of the coil springs 13, 14. coil spring 1
An inner cylinder 20 is loosely fitted between the outer peripheral portions of the bearing members 3 and 14 and the inner peripheral wall of the outer cylinder 8, and is positioned between the bearing members 9 and 9. The outer cylinder 8 has a horizontal through hole 21 located at its upper end, and a spring seat 22 is attached at its lower end. Outer cylinder 8
At the outer end of the rod 10 protruding from the spring seat 2
3 and a connecting member 24 are attached, a compression coil spring 25 is compressed between the spring seats 22 and 23, and a lateral through hole 27 is bored in the connecting member 24.

When the locking device 7 is in a locked state in which the operating lever 12 is not released, the coil springs 13 and 14 are in close contact with the rod 10, so that the outer cylinder 8 and the rod 10 have an axis in the shortening or extending direction. Even when a force is applied, the coil springs 13 and 14 tighten and fix the rod 10, so the locking device 7 maintains a strong locked state regardless of the presence or absence of the restoring force of the compression coil spring 25, and the outer cylinder 8 and rod 10 are not expanded or contracted. Also, if you pull up the operating lever 12 and operate the lock release,
The inner end portions of the coil springs 13 and 14 are both rotated in the unwinding direction via the step portions 15 and 16. The inner diameter of the coil springs 13 and 14 is uniformly increased over the entire length of the coil by rotational displacement of the operating lever 12 until the increase in outer diameter is limited by the inner cylinder 20, and the lock to the rod 10 is released. , the outer cylinder 8 and the rod 10 are expandable and retractable.
Therefore, the outer cylinder 8 and the rod 10 are extended by the restoring force of the compression coil spring 25, and shortened by applying an axial force in the opposite direction that exceeds this restoring force. When the unlocking force of the operating lever 12 is removed, the rod 10 is automatically locked in the position by the restoring force of the coil springs 13 and 14.

The locking device 7 has through holes 21 and 27 bored at both upper and lower ends thereof, and a bracket 28 fixed to the center of the upper frame 2, as shown in FIG. 1, and an upper frame of the lower frame. A bracket 29 fixed in the center has pins 30 and 3, respectively.
1. The axial center of the pin 31 is spaced a required distance L from the axial center of the pin 5 of the hinge bracket 4 to the rear of the seat to provide an overhang, and the locking device 7 is attached to the upper frame 2 from the back side of the seat back. It is constructed to securely support and lock.

By giving this overhang,
The locking device 7 constitutes one side of the oblique side of the triangular structure formed by the three pins 30, 31, and 5, and the locking device 7 always supports the upper frame 2 diagonally from the rear. It is possible to firmly support and fix the device no matter what angle of inclination it is set to.

A wire 32 extending to the outside of the seat bag is connected to the operating lever 12.
is connected to a handle such as a reclining mechanism part (not shown), and the locking device 7 is connected to the handle while seated.
The device is configured to be able to release the lock.

The seat of the first embodiment having the above-mentioned structure is unlocked by pulling the operating lever 12 of the locking device 7 via the wire 32 and becomes telescopic, and the weight of the seated person applied to the upper frame 2 is reduced. By adjusting the degree of hanging, the upper frame 2 can be tilted to the best angle suitable for the user's physique using the pin 5 as a fulcrum. Then, when the operating lever 12 is returned to this position and the locking device 7 is locked, the upper frame 2 is fixed at this position and the upper half of the seat back is adjusted to the best angle that suits the physique of the seated person. sell.

FIG. 3 shows a second embodiment of the seat of the present invention, and is a view of the seat back frame portion viewed from the back side, and is an example in which the extendable locking device 7 is constructed by a ratchet mechanism. The locking device 7 includes a pipe 33 and a casing 34 containing a ratchet mechanism for expanding and contracting the pipe 33 and locking the pipe 33.
The housing 34 is rotatably connected to the center of the upper frame of the lower frame 1 by pins 35, 35. The axis of the pin 35 is spaced a required distance l behind the seat from the axis of the pin 5 of the hinge bracket 4 to provide an overhang, and the locking device 7 is attached to the upper frame 2 from the back side of the seat back. It is constructed to securely support and lock. Inside the casing 34, as shown in exploded view in FIG. 4, a pipe 33 is rotatably supported by a pin 36 protruding from the casing 34, and the lower end of the pipe 33 is attached to the upper edge of the pin 36. A ratchet 37 hinged at 37', a claw tooth 38 meshing with the ratchet 37, a cam 39 abutting the outer edge of the claw tooth 38, and a release plate 40 to which the cam 39 is locked. The release plate 40 and the cam 39 are rotatably supported by a pin 41, and the release plate 40
A spring 42 is stretched around the side edge of the release plate 40 to constantly bias the release plate 40 clockwise.
Therefore, in the normal locked state, the cam 39 presses the pawl tooth 38, and the pawl tooth 38 and the ratchet 37
are engaged to prevent expansion and contraction of the pipe 33 and lock it in a fixed state. To release the lock,
The wire 32 connected to the release plate 40 is pulled, and the release plate 40 is rotated counterclockwise against the spring 42 using the pin 41 as a fulcrum. As a result, the cam 39, which is coaxially locked to the release plate 40, rotates counterclockwise, and the cam 39 is rotated diagonally downward, so that the state of contact with the pawl teeth 38 becomes shallower. At the same time, the pin 43 implanted on the release plate 40 and passed through the engagement hole 42 of the claw tooth 38 slides in the engagement hole 42 and rotates the claw tooth 38 clockwise around the pin 44 as a fulcrum. Move, claw tooth 3
8 and the ratchet 37 are disengaged. This allows the ratchet 37 to freely rotate about the pin 36, allowing the pipe 33 connected to the ratchet 37 to expand and contract.
In FIG. 4, reference numeral 45 is a fixing plate for assembly. In addition, when using a locking device using the illustrated ratchet mechanism, the pipe 33 is attached to the ratchet 3.
Since the axis of the pipe 33 shifts to the left and right along the circular motion of the pipe 33, the connecting portion between the upper end of the pipe 33 and the upper frame 2 is connected to a universal joint 46 as shown in FIG.
are connected by. In addition, in the illustrated example, in order to give the upper frame 2 a restoring force when adjusting the inclination angle,
A spiral leaf spring 47 is engaged with one of the hinge brackets 4.

The seat according to the present invention has the structure described above, and the seat back frame is divided into two parts, the upper frame is rotatable, and the upper frame is located at the center of the seat back and between the upper frame and the lower frame. Since an extendable locking device is installed to arbitrarily set the tilting angle of the frame, the load caused by the weight of the occupant and impact can be directly absorbed by the locking device installed in the center of the seatback. Unlike conventional reclining seats installed on the sides, reinforcement measures against torsional moments are no longer required, making the seat lighter and less expensive. Since the center of the seat back, which is located between the legs, protrudes rearward, it does not interfere with the rear seat occupant's legs, especially the kneecaps, and space can be used effectively.

Furthermore, since the seat back is divided into two parts, upper and lower, the angle of inclination of the upper half of the backrest surface of the seat back can be freely changed depending on the physique of the person sitting and the difference in the angle of inclination of the entire seat back, making it possible to adjust the angle of inclination of the upper half of the seat back to achieve the best fit for the person. The shape of the backrest surface can be formed to provide a comfortable seat.

In addition, in the present invention, the lower fulcrum of the locking device is spaced a predetermined distance from the axis connecting the rotation centers of the left and right hinge joints of the upper frame to provide an overhang. It can always be supported diagonally, and no matter what angle of inclination the upper frame is set to, it can be firmly supported and fixed, and a locking device is installed between the top surface of the lower frame and the upper frame, making it small. It can be installed in a small amount of space, and the lock device can be completely stored inside the seat bag.
It is said that it can provide beautiful sheets that look good.
It has various excellent effects.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view of the seat back frame portion of the first embodiment of the seat of the present invention, and FIG.
Enlarged sectional view showing details of the locking device in the figure, No. 3
This figure is a schematic perspective view of a seat back frame portion of a second embodiment of the seat of the present invention, and FIG. 4 is an exploded perspective view showing details of the locking device in FIG. 3. 1: Lower frame, 2: Upper frame, 4: Hinge bracket, 5: Pin serving as the rotation fulcrum of the upper frame, 7: Locking device, 30, 31: Pin serving as the upper and lower mounting fulcrum of the locking device, L, l: Over hang distance.

Claims (1)

[Scope of utility model registration request] The seatback frame is divided into two parts, an upper frame and a lower frame, and the upper frame is hinged to the lower frame at its left and right lower ends so as to be rotatable in the front and back direction, and there is a frame between the upper frame and the lower frame. An extendable locking device is located at the center of the seat back and fixing the upper frame at any rotational position. It is attached to the lower frame in an overhanging state with a predetermined distance in the front or rear relative to the axis line connecting the rotation centers of the coupling parts, and the locking device is attached to the mounting fulcrum of the upper frame side mounting part. A seat characterized in that the seat is configured to form one side of the oblique side of a triangular structure formed between the mounting fulcrum of the lower frame side mounting part and the axis of the hinge joint part.